Auntpiggylpn, I think you meant to say that your elbows should be at a 90 degree angle. I agree that having the machine inset into the table at the proper height makes a huge difference, not only in ergonomics/comfort but also in ease of maneuvering the quilt (which in the long run contributes to your comfort too). As far as quilting at a longarm, it can be easier on the body simply because you are not wrestling the quilt, and you are moving more often, not sitting in one position for long periods of time.